<template>
    <div class="todo-footer" v-show="total">
        <label>
        <!-- <input type="checkbox" :checked="isAll" @change="checkAll" /> -->
        <input type="checkbox" v-model="isAll"  />
        </label>
        <span>
        <span>已完成{{doneTotal}}</span> / 全部{{total}}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
    </div>
</template>

<script>
    export default {
        name:'MyFooter',
        props:['todos'],
        computed:{
            
            total(){
                return this.todos.length
            },
            doneTotal(){
                // let i = 0;
                // this.todos.forEach(todo => {
                //     if(todo.done == true){
                //         i++
                //     }   
                // });
                // return i;

                return this.todos.reduce((pre,current) => {
                    
                    return pre + (current.done ? 1 : 0)
                },0)
            },

            isAll:{
                get(){
                    return this.doneTotal === this.total && this.total > 0
                },
                set(value){
                    // this.checkAllTodo(value);
                    this.$emit('checkAllTodo',value)
                }  
            },
        },
        methods:{
            // checkAll(e){
            //     // console.log(e.target.checked) 
            //     this.checkAllTodo(e.target.checked);
            // },

            //清除已完成
            clearAll(){
                if(confirm('你清楚你小子在干嘛吗？')){
                    // this.clearAllTodo();
                    this.$emit('clearAllTodo');
                }
            }

        }
    }
</script>

<style scoped>
    /*footer*/
    .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
    }

    .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
    }

    .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
    }

    .todo-footer button {
    float: right;
    margin-top: 5px;
    }
</style>